本文通过对6榀1/2比例新型装配式抗震墙体的低周反复加载试验,分析了基于不同布筋方式、竖向连接方式、水平连接方式等关键参数对各试件骨架曲线与滞回性能的影响。根据试验结果,建立统一的无量纲化骨架曲线,采用试验数据回归及理论推导相结合的方法,提出了新型装配式抗震墙体考虑刚度退化的四线型骨架曲线模型,并给出了各特征点及各阶段刚度的计算公式;通过对6榀试件各滞回环卸载刚度的回归分析,建立了墙体在不同阶段的卸载刚度计算公式,并据此给出了适用于新型装配式抗震墙体的滞回规则。试验研究及计算分析表明:本文所建议的恢复力模型与试验结果吻合较好,并能较好反映各试件滞回曲线中的“捏拢”现象,可用于新型装配式抗震墙结构体系的弹塑性地震反应分析。
Based on the experiments of low cyclic reversed lateral loading on 6 precast wall models with the ratio 1 : 2, the effect of the hysteresis performances and skeleton curves on various key parameters, such as different ways of reinforcement, vertical connection and horizontal connection were analyzed. According to the experimental re- sults, an unified dimensionless skeleton curve was set up. A restoring force model of new precast seismic walls is es- tablished by adopting the combination of experimental data regression and theoretical derivation methods, and a four- linear skeleton curve model considering stiffness degradation was proposed. The equations to calculate each charac- teristic points and each stages of stiffness are recommended. Base on the regression analysis of 6 specimens of the hysteresis loop back unloading stiffness, the calculating formula of different stages of unloading stiffness was estab- lished and a hysteretic rule that can be applied to precast seismic walls is accordingly proposed. The proposed resto- ring force model agrees well with the test results from the experimental research and calculation analysis, and it can simulate the pinching phenomenon of these precast walls. The proposed restoring force model can be used to analy- sis the elastic-plastic seismic response of the precast seismic wall structure.